Making a clicking noise

This could be one of two things. 1) A bad relay on the control board making the noise . 2) The overload on the compressor making the noise. We have had more issues with the control board on the unit making a loud clicking noise. If its the overload making the noise you will hear it about every 45 seconds and it will last less than one second. I recommend replacing the main control board on this unit. See links below.